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Tell me about the Great Wall of China
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The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China to protect the rate from invasions of various nomadic groups. It is the longest wall in the world, stretching 6,259 km (3,889 mi) from Shanhai Pass, near China's eastern coast, to Lop Nur in the westernmost part of China's Xinjiang region. It is over 2,000 years old and is considered one of the greatest engineering achievements of the ancient world.